Construction & Reinforcement Types
Expansion Bellows with Liners
A lined expansion bellows has a smooth internal sleeve fitted just inside the convolutions, so the flowing media passes over the liner rather than directly over the flexible bellows material.
Representative example — real Uma Bellows expansion joint:
How it works
Convolutions are inherently more exposed to erosion and turbulence than a smooth pipe wall would be; a liner protects them from direct high-velocity or abrasive flow, extending the bellows' service life without changing its flexibility.
- Internal liner shields convolutions from direct flow contact
- Reduces erosion in high-velocity or particulate-laden service
- Does not add stiffness — the bellows still flexes normally
- Liner design accounts for its own thermal expansion within the joint
Related: High-Pressure Bellows · Thermal Sleeve Bellows · Expansion Joints
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